Simply put, if you want to see the final boss of the W storyline (the secret "Pathos V2" fight), you need Extra Quality gear.

⚠️ JPN saves won’t work on USA/EUR copies without hex editing. Always match your game version.

: High-tier saves often include LBX units equipped with up to 10 Extra Parts , a limit that was doubled from the previous game to significantly boost HP, BP, and resistances. Performance & Optimization

Linking your data provides several high-tier advantages that are otherwise difficult or impossible to obtain in the early game.